How much less efficient are north-facing solar modules?
Sometimes the south-facing rooftop just isn’t fit for solar, like for example tree shade, or a taller building on the south side of your building. So, just how bad is it to put solar panels on a north-facing roof? You might be pleasantly surprised that your north-facing roof can still be productive! The link below explains that sunlight reaches the north-facing roof from the glow of the blue sky:
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